An analysis shows that House Democrats who voted in favor of a bill that will roll back a key provision of the Dodd-Frank law on average received nearly four times as much money from large financial institutions as others who voted “no.”

Republican attorneys general have formed an unprecedented, secretive alliance with some of the nation’s top energy producers to push back against the Obama regulatory agenda, an investigation by The New York Times has found.

Chris Koster, a Democrat, said he would refuse money from any company he had investigated after allegations that he dropped out of a multistate inquiry of an energy drink maker and settled for less than other states received in a case against a drug...